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 (
    9984, 9985, 9986, 9987, 9988, 9989, 9990, 
    9991, 9992, 9993, 9994, 9995, 9996, 
    9997, 9998, 9999, 12995, 12996, 12997, 
    12998, 10734, 10735, 10736, 10737, 
    10738, 10747, 10748, 10749, 10750, 
    10751, 10752, 15744, 15745, 15746, 
    15743, 15738, 15739, 15740, 15741, 
    15742, 15736, 15737, 10668, 10669, 
    10670, 10671, 10672, 10673, 10674, 
    10675, 10676, 10677, 10678, 10679, 
    10680, 10681, 10682, 10683, 10684, 
    10685, 10686, 10607, 10608, 10609
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'ru'

Query time 0.00035

JSON explain

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