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 (
    96602, 96603, 96606, 96608, 96610, 96612, 
    96613, 96616, 96617, 96618, 96619, 
    96625, 96626, 96627, 96628, 96629, 
    96668, 96669, 96670, 96671, 96672, 
    96673, 96674, 96675, 96676, 96680, 
    96681, 96682, 96683, 96686, 96687, 
    96688, 96689, 96690, 96691, 96692, 
    96698, 96699, 96700, 96701, 96702, 
    96703, 96704, 96705, 97874, 97883, 
    97884, 97885, 97887, 97889, 98421, 
    98424, 98425, 98426, 98428, 98432, 
    98434, 98436, 98437, 98438, 98442, 
    98446, 98449, 98450, 98452, 98455, 
    98485, 98486, 98487, 98488, 98489, 
    98491, 98493, 98494, 98495, 98503, 
    98504, 98505, 98506, 98507, 98508, 
    98722, 98723, 98724, 98725, 98726, 
    98727, 98728, 98729, 98730, 98731, 
    98732, 98733, 98734, 98735, 98736
  ) 
  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 (96602,96603,96606,96608,96610,96612,96613,96616,96617,96618,96619,96625,96626,96627,96628,96629,96668,96669,96670,96671,96672,96673,96674,96675,96676,96680,96681,96682,96683,96686,96687,96688,96689,96690,96691,96692,96698,96699,96700,96701,96702,96703,96704,96705,97874,97883,97884,97885,97887,97889,98421,98424,98425,98426,98428,98432,98434,98436,98437,98438,98442,98446,98449,98450,98452,98455,98485,98486,98487,98488,98489,98491,98493,98494,98495,98503,98504,98505,98506,98507,98508,98722,98723,98724,98725,98726,98727,98728,98729,98730,98731,98732,98733,98734,98735,98736)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}