SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    85654, 84105, 83099, 92839, 92897, 92898, 
    92900, 92903, 92904, 92907, 92908, 
    92911, 92912, 92935, 92937, 92939, 
    92941, 92943, 92945, 93054, 93055, 
    93056, 93057, 93058, 93059, 93060, 
    93061, 93070, 93281, 93524, 93526, 
    93528, 93782, 93784, 93786, 94027, 
    94029, 94031, 94033, 94075, 94717, 
    94720, 94721, 94724, 94725, 94726, 
    94729, 94730
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00123

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (85654,84105,83099,92839,92897,92898,92900,92903,92904,92907,92908,92911,92912,92935,92937,92939,92941,92943,92945,93054,93055,93056,93057,93058,93059,93060,93061,93070,93281,93524,93526,93528,93782,93784,93786,94027,94029,94031,94033,94075,94717,94720,94721,94724,94725,94726,94729,94730)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}