SELECT 
  q_product_descriptions.product_id, 
  q_product_descriptions.short_description, 
  IF(
    q_product_descriptions.short_description = '', 
    q_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  q_product_descriptions 
WHERE 
  q_product_descriptions.product_id IN (
    13593, 13601, 14240, 14241, 14242, 14243, 
    14244, 14245, 14246, 14247, 14248, 
    14249, 14250, 14251, 14252, 14253, 
    14254, 14255, 14256, 14257, 14258, 
    14259, 14260, 14261, 14263, 14264, 
    14265, 14266, 14267, 14268, 14269, 
    14270
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "76.81"
    },
    "table": {
      "table_name": "q_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": 32,
      "rows_produced_per_join": 32,
      "filtered": "100.00",
      "index_condition": "((`portal`.`q_product_descriptions`.`product_id` in (13593,13601,14240,14241,14242,14243,14244,14245,14246,14247,14248,14249,14250,14251,14252,14253,14254,14255,14256,14257,14258,14259,14260,14261,14263,14264,14265,14266,14267,14268,14269,14270)) and (`portal`.`q_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "70.41",
        "eval_cost": "6.40",
        "prefix_cost": "76.81",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}