SELECT 
  cscart_product_filters.feature_id, 
  cscart_product_filters.filter_id, 
  cscart_product_filters.field_type, 
  cscart_product_filters.round_to, 
  cscart_product_filters.display, 
  cscart_product_filters.display_count, 
  cscart_product_filter_descriptions.filter, 
  cscart_product_features.feature_type, 
  cscart_product_features.filter_style, 
  cscart_product_features_descriptions.prefix, 
  cscart_product_features_descriptions.suffix, 
  cscart_product_filters.mdc_code 
FROM 
  cscart_product_filters 
  LEFT JOIN cscart_product_filter_descriptions ON cscart_product_filter_descriptions.filter_id = cscart_product_filters.filter_id 
  AND cscart_product_filter_descriptions.lang_code = 'de' 
  LEFT JOIN cscart_product_features ON cscart_product_features.feature_id = cscart_product_filters.feature_id 
  LEFT JOIN cscart_product_features_descriptions ON cscart_product_features_descriptions.feature_id = cscart_product_filters.feature_id 
  AND cscart_product_features_descriptions.lang_code = 'de' 
WHERE 
  cscart_product_filters.status = 'A' 
  AND (
    cscart_product_filters.categories_path = '' 
    OR FIND_IN_SET(
      331, cscart_product_filters.categories_path
    )
  ) 
ORDER BY 
  cscart_product_filters.position, 
  cscart_product_filter_descriptions.filter

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "63.84"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_filters",
            "access_type": "ALL",
            "rows_examined_per_scan": 107,
            "rows_produced_per_join": 10,
            "filtered": "10.00",
            "cost_info": {
              "read_cost": "23.18",
              "eval_cost": "2.14",
              "prefix_cost": "25.32",
              "data_read_per_join": "8K"
            },
            "used_columns": [
              "filter_id",
              "categories_path",
              "feature_id",
              "position",
              "field_type",
              "status",
              "round_to",
              "display_count",
              "display",
              "mdc_code"
            ],
            "attached_condition": "((`danishecarter_latest`.`cscart_product_filters`.`status` = 'A') and ((`danishecarter_latest`.`cscart_product_filters`.`categories_path` = '') or find_in_set(331,`danishecarter_latest`.`cscart_product_filters`.`categories_path`)))"
          }
        },
        {
          "table": {
            "table_name": "cscart_product_filter_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "filter_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "danishecarter_latest.cscart_product_filters.filter_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "10.70",
              "eval_cost": "2.14",
              "prefix_cost": "38.16",
              "data_read_per_join": "8K"
            },
            "used_columns": [
              "filter_id",
              "lang_code",
              "filter"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_features",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "danishecarter_latest.cscart_product_filters.feature_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "10.70",
              "eval_cost": "2.14",
              "prefix_cost": "51.00",
              "data_read_per_join": "12K"
            },
            "used_columns": [
              "feature_id",
              "filter_style",
              "feature_type"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_features_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "danishecarter_latest.cscart_product_filters.feature_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "10.70",
              "eval_cost": "2.14",
              "prefix_cost": "63.84",
              "data_read_per_join": "24K"
            },
            "used_columns": [
              "feature_id",
              "prefix",
              "suffix",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}

Result

feature_id filter_id field_type round_to display display_count filter feature_type filter_style prefix suffix mdc_code
1041 691 0.01 Y 10 Ad Online since S checkbox mdc_ad_online_since
1042 692 0.01 Y 10 Additional Features M checkbox mdc_additional_features
1101 751 0.01 Y 10 Axels S checkbox mdc_axels
18 10 1 Y 10 Brand E checkbox
1022 672 0.01 Y 10 Categories S checkbox mdc_categories
1024 674 0.01 Y 10 Climatisations S checkbox mdc_climatisations
549 313 0.01 Y 10 Color S checkbox
0 348 S 0.01 Y 10 Company
1032 682 0.01 Y 10 Construction Year N slider mdc_construction_year
1036 686 0.01 Y 10 Country S checkbox mdc_countryversion
1054 704 0.01 Y 10 Cruise Control S checkbox mdc_speedcontrols
1061 711 0.01 Y 10 Cubic Capacity N slider mdc_cubic_capacity
1026 676 0.01 Y 10 Cylinder N slider mdc_cylinder
1033 683 0.01 Y 10 Damage Unrepaired S checkbox mdc_damageunrepaired
1055 705 0.01 Y 10 Displacement N slider mdc_displacement
1111 761 0.01 Y 10 Driving Cabs S checkbox mdc_drivingcabs
1049 699 0.01 Y 10 Emmission Class S checkbox mdc_emissionclasses
1028 678 0.01 Y 10 Emmission Stickers S checkbox mdc_emissionstickers
1052 702 0.01 Y 10 Exterior Colour S checkbox mdc_colors
1046 696 0.01 Y 10 First Registration N slider mdc_firstRegistration
1027 677 0.01 Y 10 Fuel Tank Volume N slider mdc_tank_size
1056 706 0.01 Y 10 Fuels S checkbox mdc_fuels
1034 684 0.01 Y 10 General Inspection T mdc_general_inspection
1112 762 0.01 Y 10 Hydralic Installation S checkbox mdc_hydraulicinstallations
1135 771 0.01 Y 10 Licensed Weight N slider mdc_licensedweight
1023 673 0.01 Y 10 Makers E checkbox mdc_makers
1045 695 0.01 Y 10 Mileage N slider mdc_mileage
456 474 0.01 Y 10 name
1040 690 0.01 Y 10 Offer details additional variants M checkbox mdc_offer_details_additional
1134 770 0.01 Y 10 Permissible weight N slider mdc_mdc_pw
1102 752 0.01 Y 10 Permissible weight N slider mdc_pw
1029 679 0.01 Y 10 Power N slider mdc_power
0 1 P 1 Y 10 Price mdc_price
1030 680 0.01 Y 10 Price Types S checkbox mdc_pricetypes
1039 689 0.01 Y 10 Providers S checkbox mdc_providers
1035 685 0.01 Y 10 Schwacke Code T mdc_schwackeCode
548 312 0.01 Y 10 Size S checkbox
1067 717 0.01 Y 10 Support load S checkbox mdc_support_load
646 349 0.01 Y 10 test number N slider
1051 701 0.01 Y 10 Transmission S checkbox mdc_gearboxes
1037 687 0.01 Y 10 Usage Types S checkbox mdc_usagetypes
1031 681 0.01 Y 10 Vehicle condition S checkbox mdc_conditions
1038 688 0.01 Y 10 Weight N slider mdc_weight
1113 763 0.01 Y 10 Wheel formulas S checkbox mdc_wheelformulas