SELECT 
  product_id, 
  short_description, 
  full_description 
FROM 
  q_product_descriptions 
WHERE 
  product_id IN (
    40744, 40745, 40758, 40759, 40761, 40768, 
    40769, 40770, 40776, 40788, 40789, 
    40790, 40791, 40792, 40793, 40794, 
    40795, 40796, 40809, 40821, 40827, 
    40828, 40829, 40830, 40831, 40832, 
    40833, 40834, 40835, 40836, 40837, 
    40839
  ) 
  AND lang_code = 'en'

Query time 0.00113

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "76.81"
    },
    "table": {
      "table_name": "q_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": 32,
      "rows_produced_per_join": 32,
      "filtered": "100.00",
      "index_condition": "((`portal`.`q_product_descriptions`.`product_id` in (40744,40745,40758,40759,40761,40768,40769,40770,40776,40788,40789,40790,40791,40792,40793,40794,40795,40796,40809,40821,40827,40828,40829,40830,40831,40832,40833,40834,40835,40836,40837,40839)) and (`portal`.`q_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "70.41",
        "eval_cost": "6.40",
        "prefix_cost": "76.81",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}