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 (
    83129, 90085, 91309, 92146, 83994, 83995, 
    83996, 83997, 92018, 92106, 89012, 
    91302, 91371, 91373, 86382, 89192, 
    85541, 91370, 92003, 92004, 92005, 
    92006, 92007, 92008, 92009, 92091, 
    92092, 92093, 92094, 92095, 92096, 
    92097, 92203, 92449, 91381, 91383, 
    83113, 83123, 83990, 83991, 83992, 
    83993, 89614, 89627, 83100, 85532, 
    91294, 84106
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00110

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "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 (83129,90085,91309,92146,83994,83995,83996,83997,92018,92106,89012,91302,91371,91373,86382,89192,85541,91370,92003,92004,92005,92006,92007,92008,92009,92091,92092,92093,92094,92095,92096,92097,92203,92449,91381,91383,83113,83123,83990,83991,83992,83993,89614,89627,83100,85532,91294,84106)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}