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 (
    24869, 24868, 24439, 23514, 23512, 20695, 
    20466, 22035, 22036, 23533, 23530, 
    23622, 23623, 21665, 24727, 22298, 
    24231, 23515, 22034, 23513
  ) 
  AND pfv.product_id IN (
    33725, 43652, 33723, 3286, 3872, 855, 
    854, 35176, 35172, 35731, 23261, 46982, 
    464, 41429, 33724, 856, 34053
  ) 
  AND pfv.lang_code = 'vi'

Query time 0.01599

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": 359,
          "filtered": 0.755200744,
          "attached_condition": "pfv.feature_id in (24869,24868,24439,23514,23512,20695,20466,22035,22036,23533,23530,23622,23623,21665,24727,22298,24231,23515,22034,23513) and pfv.product_id in (33725,43652,33723,3286,3872,855,854,35176,35172,35731,23261,46982,464,41429,33724,856,34053) 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'"
        }
      }
    ]
  }
}