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 (
    22243, 19646, 24203, 19651, 21057, 19650, 
    22573, 22831, 22419, 22245, 22333, 
    22826, 21267, 23757, 21965, 21912, 
    19648, 21925, 20980, 22368, 20439, 
    21430, 22576
  ) 
  AND pfv.product_id IN (
    534, 6559, 41229, 6554, 2458, 6555, 2255, 
    26854, 286, 25180, 405, 26864, 36834, 
    933, 1059, 6557, 1041, 2567, 25850, 
    3975, 1835, 2257
  ) 
  AND pfv.lang_code = 'vi'

Query time 0.03128

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"],
          "rows": 131,
          "filtered": 0.258526951,
          "index_condition": "pfv.product_id in (534,6559,41229,6554,2458,6555,2255,26854,286,25180,405,26864,36834,933,1059,6557,1041,2567,25850,3975,1835,2257)",
          "attached_condition": "pfv.feature_id in (22243,19646,24203,19651,21057,19650,22573,22831,22419,22245,22333,22826,21267,23757,21965,21912,19648,21925,20980,22368,20439,21430,22576) 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'"
        }
      }
    ]
  }
}