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 (
    96302, 96303, 96712, 96716, 96721, 96729, 
    96730, 96731, 96736, 96737, 96750, 
    96753, 96754, 96768, 96769, 96788, 
    97012, 97020, 97036, 97043, 97049, 
    97051, 97055, 97810, 97814, 97816, 
    97817, 97834, 97838, 97840, 97988, 
    97992, 98030, 98034, 98159, 98163, 
    98167, 98224, 98225, 98226, 98227, 
    98228, 98234, 98235, 98236, 98237, 
    98238, 98239, 98240, 98241, 98242, 
    98243, 98244, 98245, 98246, 98247, 
    98248, 98249, 98688, 98691, 98692, 
    98697, 98740, 98744, 98748, 99570, 
    99581, 99585, 100068, 100071, 100151, 
    100155, 100175, 100177, 100179, 100322, 
    100325, 100602, 100603, 100604, 100608, 
    100609, 100611, 100696, 100697, 100698, 
    100699, 100886, 100902, 100909, 100915, 
    100917, 100921, 101114, 101123, 101132
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00154

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (96302,96303,96712,96716,96721,96729,96730,96731,96736,96737,96750,96753,96754,96768,96769,96788,97012,97020,97036,97043,97049,97051,97055,97810,97814,97816,97817,97834,97838,97840,97988,97992,98030,98034,98159,98163,98167,98224,98225,98226,98227,98228,98234,98235,98236,98237,98238,98239,98240,98241,98242,98243,98244,98245,98246,98247,98248,98249,98688,98691,98692,98697,98740,98744,98748,99570,99581,99585,100068,100071,100151,100155,100175,100177,100179,100322,100325,100602,100603,100604,100608,100609,100611,100696,100697,100698,100699,100886,100902,100909,100915,100917,100921,101114,101123,101132)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}