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 (
    10063, 10052, 10072, 10046, 10059, 10064, 
    10057, 10048, 10062, 10070, 10058, 
    10045, 10054, 10047, 10067, 10051, 
    10060, 10055, 10043, 10068
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00033

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 (10063,10052,10072,10046,10059,10064,10057,10048,10062,10070,10058,10045,10054,10047,10067,10051,10060,10055,10043,10068) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}