SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    37497, 37606, 37607, 37608, 37609, 37610, 
    37611, 37612, 37613, 37614, 37615, 
    37616, 37617, 37618, 37619, 37620, 
    37621, 37622, 37623, 37624, 37625, 
    37626, 37627, 37628, 37629, 37630, 
    37631, 37632, 37633, 37634, 37635, 
    37636, 37637, 37638, 37639, 37640, 
    37641, 37642, 37643, 37644, 37645, 
    37646, 37647, 37648, 37649
  ) 
  AND feature_id IN (23802, 23803) 
  AND lang_code = 'vi'

Query time 0.00485

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features_values",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "idx_product_feature_variant_id",
          "key_length": "12",
          "used_key_parts": ["product_id", "feature_id", "lang_code"],
          "rows": 90,
          "filtered": 100,
          "attached_condition": "cscart_product_features_values.product_id in (37497,37606,37607,37608,37609,37610,37611,37612,37613,37614,37615,37616,37617,37618,37619,37620,37621,37622,37623,37624,37625,37626,37627,37628,37629,37630,37631,37632,37633,37634,37635,37636,37637,37638,37639,37640,37641,37642,37643,37644,37645,37646,37647,37648,37649) and cscart_product_features_values.feature_id in (23802,23803) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}