SELECT 
  cscart_product_descriptions.product_id, 
  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 (
    10478, 9883, 9901, 10493, 10485, 10476, 
    10479, 10492, 10468, 9903, 10487, 9899, 
    10473, 10486, 9881, 9896, 9892, 10481, 
    9876, 10474
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00063

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 (10478,9883,9901,10493,10485,10476,10479,10492,10468,9903,10487,9899,10473,10486,9881,9896,9892,10481,9876,10474) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}