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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 (
    18516, 51007, 51004, 51005, 51010, 51008, 
    51012, 51011, 51013, 51006, 51015, 
    51016, 51021, 51017, 51018, 51019, 
    51024, 51014, 51022, 51422, 51045, 
    51025, 51440, 51424, 51029, 51442, 
    51429, 51436, 51060, 51020, 51423, 
    51430, 51027, 51433, 51063, 51067, 
    51031, 51062, 51026, 51441, 51035, 
    51435, 51425, 51028, 51431, 51434, 
    51432, 51041, 51033, 51042, 51030, 
    51032, 51037, 51064, 51070, 51426, 
    51038, 51050, 51052, 51059, 51065, 
    51066, 51023, 51055, 51061, 51039, 
    51056, 51069, 51040, 51034, 51036, 
    51009, 51058, 51068, 51071
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00026

JSON explain

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