Sandbox

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 (
    10478, 9883, 9901, 10493, 10485, 10476, 
    10479, 10494, 10492, 10468, 9903, 10487, 
    9899, 10473, 10486, 9881, 9896, 9892, 
    10481, 9876, 10474, 10491, 10489, 10471, 
    9880, 10472, 9885, 10488, 9897, 9895, 
    10467, 9900, 10470, 10466, 10477, 9889, 
    10475, 9890, 10483, 10495, 10490, 10469, 
    9877, 9894, 9891, 10480, 9893, 9878, 
    9886, 9882, 9888, 10482
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00081

JSON explain

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