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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 (
    12570, 12578, 12568, 12547, 12569, 12584, 
    12592, 12575, 12574, 12550, 12544, 
    12564, 12577, 12579, 12555, 12560, 
    12556, 12561, 12572, 12583, 12591, 
    12582, 12590, 12571, 12632, 12559, 
    12631, 10596, 10597, 10598, 10599, 
    10600, 10521, 10520, 10519, 10518, 
    10517, 10516, 10515, 10514, 10513, 
    10512, 10511, 10510, 10509, 10508, 
    10507, 10506, 10505, 10504, 10503, 
    10502, 10501, 10500, 10499, 10498, 
    10497, 9839, 12702, 9841, 9848, 9840, 
    9844, 9843
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}