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 (
    96657, 96658, 96659, 96660, 96661, 96662, 
    96663, 96664, 96665, 96666, 96667, 
    96695, 96696, 96697, 97743, 97744, 
    97745, 97746, 97747, 97748, 97749, 
    97750, 97751, 97752, 97753, 97754, 
    97755, 97756, 97757, 97758, 97759, 
    97760, 97761, 97762, 97763, 97764, 
    97795, 97796, 97797, 97798, 98052, 
    98053, 98149, 98150, 98153, 98156, 
    98762, 98851, 98852, 98853, 98854, 
    98855, 98856, 98857, 98858, 99133, 
    99141, 99142, 99151, 99152, 99169, 
    99170, 99248, 99257, 99262, 99322, 
    99323, 99404, 99405, 99406, 99407, 
    99408, 99409, 99410, 99411, 100392, 
    100433, 100437, 100677, 100678, 100679, 
    100680, 100681, 100682, 100683, 100684, 
    100685, 100686, 100687, 100688, 100689, 
    100690, 100691, 100692, 100693, 100694
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00157

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 (96657,96658,96659,96660,96661,96662,96663,96664,96665,96666,96667,96695,96696,96697,97743,97744,97745,97746,97747,97748,97749,97750,97751,97752,97753,97754,97755,97756,97757,97758,97759,97760,97761,97762,97763,97764,97795,97796,97797,97798,98052,98053,98149,98150,98153,98156,98762,98851,98852,98853,98854,98855,98856,98857,98858,99133,99141,99142,99151,99152,99169,99170,99248,99257,99262,99322,99323,99404,99405,99406,99407,99408,99409,99410,99411,100392,100433,100437,100677,100678,100679,100680,100681,100682,100683,100684,100685,100686,100687,100688,100689,100690,100691,100692,100693,100694)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}