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 (
    99432, 99433, 99434, 99435, 99436, 99437, 
    99529, 99530, 99531, 99532, 99533, 
    99534, 99535, 99536, 99537, 99538, 
    99539, 99540, 99541, 99542, 99543, 
    99544, 99545, 99546, 99547, 99548, 
    99549, 99550, 99551, 99552, 99553, 
    99554, 99555, 99556, 99557, 99574, 
    99575, 99576, 100143, 100161, 100162, 
    100163, 100164, 100165, 100166, 100167, 
    100168, 100388, 100389, 100390, 100391, 
    100431, 100432, 100435, 100436, 100665, 
    100666, 100667, 100668, 100669, 100670, 
    100671, 100672, 100673, 100674, 100675, 
    100676, 101011, 101012, 101013, 101014, 
    101015, 101016, 101017, 101018, 101019, 
    101020, 101021, 101625, 101637, 101638, 
    101669, 101670, 101672, 101673, 101674, 
    101675, 101676, 101677, 101682, 101683, 
    101688, 101689, 101690, 101691, 101692
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00091

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 (99432,99433,99434,99435,99436,99437,99529,99530,99531,99532,99533,99534,99535,99536,99537,99538,99539,99540,99541,99542,99543,99544,99545,99546,99547,99548,99549,99550,99551,99552,99553,99554,99555,99556,99557,99574,99575,99576,100143,100161,100162,100163,100164,100165,100166,100167,100168,100388,100389,100390,100391,100431,100432,100435,100436,100665,100666,100667,100668,100669,100670,100671,100672,100673,100674,100675,100676,101011,101012,101013,101014,101015,101016,101017,101018,101019,101020,101021,101625,101637,101638,101669,101670,101672,101673,101674,101675,101676,101677,101682,101683,101688,101689,101690,101691,101692)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}