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 (
    97119, 97120, 97121, 97122, 97123, 97124, 
    97125, 97126, 97127, 97128, 97129, 
    97130, 97131, 97132, 97133, 97134, 
    97135, 97136, 97137, 97138, 97139, 
    97140, 97141, 97142, 97143, 97144, 
    97145, 97146, 97147, 97148, 97149, 
    97150, 97151, 97152, 97153, 97154, 
    97155, 97156, 97157, 97158, 97159, 
    97160, 97161, 97162, 97163, 97164, 
    97165, 97166
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00112

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 (97119,97120,97121,97122,97123,97124,97125,97126,97127,97128,97129,97130,97131,97132,97133,97134,97135,97136,97137,97138,97139,97140,97141,97142,97143,97144,97145,97146,97147,97148,97149,97150,97151,97152,97153,97154,97155,97156,97157,97158,97159,97160,97161,97162,97163,97164,97165,97166)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}