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 (
    96162, 96163, 96164, 96165, 96166, 96167, 
    96168, 96169, 96349, 97059, 97060, 
    97061, 97062, 97063, 97064, 97065, 
    97066, 97067, 97068, 97069, 97070, 
    97071, 97072, 97073, 97074, 97075, 
    97076, 97077, 97078, 97079, 97080, 
    97081, 97082, 97084, 97085, 97086, 
    97087, 97088, 97089, 97090, 97091, 
    97092, 97093, 97094, 97095, 97096, 
    97097, 97098
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00101

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 (96162,96163,96164,96165,96166,96167,96168,96169,96349,97059,97060,97061,97062,97063,97064,97065,97066,97067,97068,97069,97070,97071,97072,97073,97074,97075,97076,97077,97078,97079,97080,97081,97082,97084,97085,97086,97087,97088,97089,97090,97091,97092,97093,97094,97095,97096,97097,97098)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}