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 (
    24744, 23690, 23691, 22396, 25022, 25021, 
    23536, 23537, 20879, 19627, 21054, 
    25095, 25096, 21021, 23415, 24703, 
    21383, 19628, 24240, 20345
  ) 
  AND pfv.product_id IN (
    47016, 36329, 319, 27357, 35249, 2932, 
    14822, 2461, 40824, 2505, 33177, 47018, 
    49306, 1897, 6577, 33214, 4238
  ) 
  AND pfv.lang_code = 'vi'

Query time 0.03843

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": "PRIMARY",
          "key_length": "6",
          "used_key_parts": ["feature_id", "product_id"],
          "rows": 366,
          "filtered": 0.703962505,
          "attached_condition": "pfv.feature_id in (24744,23690,23691,22396,25022,25021,23536,23537,20879,19627,21054,25095,25096,21021,23415,24703,21383,19628,24240,20345) and pfv.product_id in (47016,36329,319,27357,35249,2932,14822,2461,40824,2505,33177,47018,49306,1897,6577,33214,4238) and pfv.lang_code = 'vi'",
          "using_index": true
        }
      },
      {
        "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'"
        }
      }
    ]
  }
}