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SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    9689, 9690, 12560, 12561, 9775, 9776, 
    9777, 9778, 9779, 9780, 9781, 9782, 
    9783, 9784, 9785, 9786, 9787, 9788, 
    9790, 9791
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (9689,9690,12560,12561,9775,9776,9777,9778,9779,9780,9781,9782,9783,9784,9785,9786,9787,9788,9790,9791) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id	short_description	full_description
9689
9690
9775		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9776		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9777		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9778		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9779		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9780		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9781		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9782		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9783		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9784		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9785		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9786		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9787		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9788		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9790		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
9791		<p> Коллекция Фантазия </p><p><iframe width="100%" height="315" src="https://www.youtube.com/embed/aQE34Ct0KGU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></p>
12560	<p>Внимание! При размещении заказа просим учитывать, что настройки цвето-передачи экрана индивидуальны и могут не отражать реальный оттенок товара.</p>
12561	<p>Внимание! При размещении заказа просим учитывать, что настройки цвето-передачи экрана индивидуальны и могут не отражать реальный оттенок товара.</p>