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 (
    89462, 89470, 89478, 88563, 89446, 88982, 
    88999, 88988, 88062, 88176, 88224, 
    88244, 88248, 89448, 89461, 89469, 
    89477, 88772, 89445, 88981, 88998, 
    88531, 87461, 88501, 91443, 91457, 
    85729, 85746, 85756, 85766, 88987, 
    85736, 88771, 88174, 88222, 88243, 
    88247, 88758, 89964, 90838, 90840, 
    91530, 89454, 89467, 89475, 89483, 
    87450, 88200, 88212, 88236, 88240, 
    88503, 91445, 91459, 88678, 88725, 
    88534, 89459, 88979, 88996, 87465, 
    88499, 91455, 89022, 85672, 85692, 
    85704, 85716, 88169, 88217, 88528, 
    87514, 87530, 88452, 88469, 88485, 
    88985, 85680, 88663, 88710, 87453, 
    87464, 88502, 88677, 88724, 89575, 
    91444, 85727, 85744, 85754, 85764, 
    88770, 88198, 88210, 88235, 88239
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00079

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 (89462,89470,89478,88563,89446,88982,88999,88988,88062,88176,88224,88244,88248,89448,89461,89469,89477,88772,89445,88981,88998,88531,87461,88501,91443,91457,85729,85746,85756,85766,88987,85736,88771,88174,88222,88243,88247,88758,89964,90838,90840,91530,89454,89467,89475,89483,87450,88200,88212,88236,88240,88503,91445,91459,88678,88725,88534,89459,88979,88996,87465,88499,91455,89022,85672,85692,85704,85716,88169,88217,88528,87514,87530,88452,88469,88485,88985,85680,88663,88710,87453,87464,88502,88677,88724,89575,91444,85727,85744,85754,85764,88770,88198,88210,88235,88239)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}