SELECT 
  pfv.feature_id, 
  pfv.product_id, 
  pfv.variant_id, 
  fv.position, 
  fvd.variant 
FROM 
  cscart_product_features_values AS pfv 
  INNER JOIN cscart_product_feature_variants AS fv ON pfv.feature_id = fv.feature_id 
  AND pfv.variant_id = fv.variant_id 
  INNER JOIN cscart_product_feature_variant_descriptions AS fvd ON pfv.variant_id = fvd.variant_id 
  AND fvd.lang_code = 'vi' 
WHERE 
  pfv.feature_id IN (
    23319, 23332, 23328, 23329, 23334, 23312, 
    23799, 24172, 23321, 21662, 23320, 
    25015, 25009, 25010, 25112, 25070, 
    25111, 25013, 25069
  ) 
  AND pfv.product_id IN (
    32313, 32324, 32404, 32327, 32307, 37416, 
    40914, 32315, 1415, 32314, 49304, 49324, 
    49300, 49330, 49337, 49302, 49354, 
    50056, 49831, 50054, 49841, 49827
  ) 
  AND pfv.lang_code = 'vi'

Query time 0.03870

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "pfv",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "variant_id",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "product_id",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rowid_filter": {
            "range": {
              "key": "fl",
              "used_key_parts": ["feature_id", "lang_code"]
            },
            "rows": 109,
            "selectivity_pct": 0.068898384
          },
          "rows": 108,
          "filtered": 0.068898387,
          "index_condition": "pfv.product_id in (32313,32324,32404,32327,32307,37416,40914,32315,1415,32314,49304,49324,49300,49330,49337,49302,49354,50056,49831,50054,49841,49827)",
          "attached_condition": "pfv.feature_id in (23319,23332,23328,23329,23334,23312,23799,24172,23321,21662,23320,25015,25009,25010,25112,25070,25111,25013,25069) and pfv.lang_code = 'vi'"
        }
      },
      {
        "table": {
          "table_name": "fv",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "feature_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "ref": ["dev_db.pfv.variant_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "fv.feature_id = pfv.feature_id"
        }
      },
      {
        "table": {
          "table_name": "fvd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": ["dev_db.pfv.variant_id", "const"],
          "rows": 1,
          "filtered": 100,
          "index_condition": "fvd.lang_code = 'vi'"
        }
      }
    ]
  }
}