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 (
    10704, 10705, 10706, 10707, 10708, 10709, 
    10710, 10712
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00045

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": 8,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (10704,10705,10706,10707,10708,10709,10710,10712) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}