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 (
    99014, 99015, 99016, 99017, 99018, 99019, 
    99588, 99589, 99590, 99591, 99592, 
    99593, 99594, 99595, 99596, 99597, 
    99598, 99599, 99600, 99601, 99602, 
    99603, 99604, 99605, 99606, 99607, 
    99608, 99609, 99610, 99611, 99612, 
    99613, 99614, 99615, 99616, 99617, 
    99618, 99619, 99620, 99621, 99622, 
    99623, 99624, 99625, 99626, 99627, 
    99628, 99629, 99630, 99631, 99632, 
    99633, 99634, 99635, 99636, 99637, 
    99638, 99639, 99640, 99641, 99642, 
    99643, 99644, 99645, 99646, 99647, 
    99669, 99670, 99671, 99672, 99673, 
    99674, 99675, 99676, 99677, 99678, 
    99679, 99680, 99681, 99682, 99683, 
    99684, 99685, 99686, 99687, 99688, 
    99689, 99690, 99691, 99692, 99693, 
    99694, 99695, 99696, 99697, 99698
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00153

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 (99014,99015,99016,99017,99018,99019,99588,99589,99590,99591,99592,99593,99594,99595,99596,99597,99598,99599,99600,99601,99602,99603,99604,99605,99606,99607,99608,99609,99610,99611,99612,99613,99614,99615,99616,99617,99618,99619,99620,99621,99622,99623,99624,99625,99626,99627,99628,99629,99630,99631,99632,99633,99634,99635,99636,99637,99638,99639,99640,99641,99642,99643,99644,99645,99646,99647,99669,99670,99671,99672,99673,99674,99675,99676,99677,99678,99679,99680,99681,99682,99683,99684,99685,99686,99687,99688,99689,99690,99691,99692,99693,99694,99695,99696,99697,99698)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}