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 (
    32654, 32655, 32656, 32657, 32658, 32659, 
    32660, 32661, 32662, 32663, 32664, 
    32665, 32666, 32667, 32668, 32669, 
    32671, 32672, 32673, 32675, 32676, 
    32677, 32679, 32680, 32681, 32682, 
    32683, 32684, 32685, 32686, 32687, 
    32688
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00074

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 (32654,32655,32656,32657,32658,32659,32660,32661,32662,32663,32664,32665,32666,32667,32668,32669,32671,32672,32673,32675,32676,32677,32679,32680,32681,32682,32683,32684,32685,32686,32687,32688)) 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"
      ]
    }
  }
}