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SELECT 
  cscart_ult_product_descriptions.product_id, 
  cscart_ult_product_descriptions.short_description, 
  IF(
    cscart_ult_product_descriptions.short_description = "", 
    cscart_ult_product_descriptions.full_description, 
    ""
  ) AS full_description, 
  cscart_ult_product_descriptions.meta_keywords, 
  cscart_ult_product_descriptions.meta_description, 
  cscart_ult_product_descriptions.search_words, 
  cscart_ult_product_descriptions.promo_text 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  cscart_ult_product_descriptions.product_id IN (
    21567, 51083, 22715, 51082, 51085, 51081, 
    51096, 51097, 51098, 51100, 51099, 
    22716, 51123, 51122, 51121, 92, 49, 
    51129, 51128, 51127, 51126, 51125, 
    48, 51176, 51174, 51173, 51172, 91, 
    51221, 137, 51224, 51223, 126, 51343, 
    51342, 51341, 51340, 47, 105, 50989, 
    31, 51366, 51367, 51368, 51369, 46, 
    51370, 51371, 51372, 51373, 51452, 
    51453, 88, 51395, 51396, 51397, 51555, 
    51556, 51496
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}