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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 (
    21, 46, 48, 49, 50, 51, 53, 91, 92, 105, 
    129, 138, 139, 21567, 22712, 22713, 
    22714, 22715, 22716, 50989, 51081, 
    51082, 51083, 51085, 51086, 51087, 
    51088, 51089, 51090, 51091, 51092, 
    51093, 51095, 51096, 51097, 51098, 
    51099, 51100, 51101, 51102, 51103, 
    51105, 51121, 51122, 51123, 51125, 
    51126, 51127, 51128, 51129, 51152, 
    51153, 51154, 51155, 51156, 51157, 
    51158, 51159, 51160, 51172, 51173, 
    51174, 51176, 51296, 51297, 51298, 
    51299, 51300, 51301, 51302, 51303, 
    51304, 51305, 51306, 51307, 51308, 
    51309, 51316, 51317, 51318, 51319, 
    51320, 51321, 51322, 51323, 51324, 
    51370, 51371, 51372, 51373, 51443, 
    51452, 51453, 51496, 51497, 51498, 
    51564, 51565, 51566, 51567, 51568, 
    51569, 51570, 51571, 51572, 51573, 
    51574, 51575, 51576, 51577, 51578, 
    51579, 51580, 51581, 51582, 51583, 
    51584, 51585, 51586
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00029

JSON explain

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