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 (
    33116, 33117, 33118, 33119, 33120, 33121, 
    33122, 33123, 33124, 33125, 33126, 
    33127, 33128, 33129, 33130, 33131, 
    33132, 33133, 33134, 33135, 33136, 
    33137, 33138, 33139, 33140, 33141, 
    33142, 33143, 33144, 33145, 33146, 
    33148
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00063

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 (33116,33117,33118,33119,33120,33121,33122,33123,33124,33125,33126,33127,33128,33129,33130,33131,33132,33133,33134,33135,33136,33137,33138,33139,33140,33141,33142,33143,33144,33145,33146,33148)) 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"
      ]
    }
  }
}