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 = 'en' 
  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 = 'en' 
WHERE 
  cscart_product_filters.status = 'A' 
  AND (
    cscart_product_filters.categories_path = '' 
    OR FIND_IN_SET(
      301, cscart_product_filters.categories_path
    )
  ) 
ORDER BY 
  cscart_product_filters.position, 
  cscart_product_filter_descriptions.filter

Query time 0.00106

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "64.67"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_filters",
            "access_type": "ALL",
            "rows_examined_per_scan": 109,
            "rows_produced_per_join": 10,
            "filtered": "10.00",
            "cost_info": {
              "read_cost": "23.25",
              "eval_cost": "2.18",
              "prefix_cost": "25.43",
              "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(301,`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": "10.90",
              "eval_cost": "2.18",
              "prefix_cost": "38.51",
              "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": "10.90",
              "eval_cost": "2.18",
              "prefix_cost": "51.59",
              "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": "10.90",
              "eval_cost": "2.18",
              "prefix_cost": "64.67",
              "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
923 573 0.01 Y 10 Ad Online since S checkbox mdc_ad_online_since
873 523 0.01 Y 10 Approved Seats S checkbox mdc_approved_seats
874 524 0.01 Y 10 Axels S checkbox mdc_axels
18 10 1 Y 10 Brand E checkbox
825 475 0.01 Y 10 Categories S checkbox mdc_categories
905 555 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
906 556 0.01 Y 10 Conditions S checkbox mdc_conditions
907 557 0.01 Y 10 Construction Year N slider mdc_construction_year
915 565 0.01 Y 10 Country S checkbox mdc_countryversion
839 489 0.01 Y 10 Cruise Control S checkbox mdc_speedcontrols
829 479 0.01 Y 10 Cylinder N slider mdc_cylinder
908 558 0.01 Y 10 Damage Unrepaired S checkbox mdc_damageunrepaired
838 488 0.01 Y 10 Drive Types S checkbox mdc_drivetypes
834 484 0.01 Y 10 Emmission Class S checkbox mdc_emissionclasses
831 481 0.01 Y 10 Emmission Stickers S checkbox mdc_emissionstickers
903 553 0.01 Y 10 First Registration N slider mdc_firstRegistration
902 552 0.01 Y 10 Fuels S checkbox mdc_fuels
836 486 0.01 Y 10 Gearboxes S checkbox mdc_gearboxes
909 559 0.01 Y 10 General Inspection T mdc_general_inspection
870 520 0.01 Y 10 Heating Types S checkbox mdc_heatingtypes
910 560 0.01 Y 10 Licensed Weight T mdc_licensedweight
827 477 0.01 Y 10 Makers E checkbox mdc_makers
912 562 0.01 Y 10 Matte Color S checkbox mdc_mattecolor
918 568 0.01 Y 10 MDC Height N slider mdc_height
920 570 0.01 Y 10 MDC length N slider mdc_length
917 567 0.01 Y 10 MDC Weight N slider mdc_weight
919 569 0.01 Y 10 MDC width N slider mdc_width
911 561 0.01 Y 10 Metallic Color S checkbox mdc_metallic
904 554 0.01 Y 10 Mileage N slider mdc_mileage
837 487 0.01 Y 10 Mobilede Colors S checkbox mdc_colors
895 545 0.01 Y 10 Motorhome Additional Equipments M checkbox mdc_motor_home_equipments
456 474 0.01 Y 10 name
872 522 0.01 Y 10 Number of Beds N slider mdc_no_of_beds
878 528 0.01 Y 10 Number of bunks S checkbox mdc_num_of_bunks
844 494 0.01 Y 10 Number of previous owners N slider mdc_numberOfPreviousOwners
922 572 0.01 Y 10 Offer details additional variants M checkbox mdc_offer_details_additional
851 501 0.01 Y 10 Parking assistants M checkbox mdc_parkingassistants
877 527 0.01 Y 10 Payload N slider mdc_payload
875 525 0.01 Y 10 Permissible weight N slider mdc_pw
913 563 0.01 Y 10 Power N slider mdc_power
0 1 P 1 Y 10 Price mdc_price
901 551 0.01 Y 10 Price Types S checkbox mdc_pricetypes
921 571 0.01 Y 10 Providers S checkbox mdc_providers
914 564 0.01 Y 10 Schwacke Code T mdc_schwackeCode
871 521 0.01 Y 10 Seating Groups S checkbox mdc_seating_groups
548 312 0.01 Y 10 Size S checkbox
850 500 0.01 Y 10 Support load S checkbox mdc_support_load
830 480 0.01 Y 10 Tank Size N slider mdc_tank_size
646 349 0.01 Y 10 test number N slider
835 485 0.01 Y 10 Trailer coupling type S checkbox mdc_trailercouplingtypes
852 502 0.01 Y 10 Trailer hitch S checkbox mdc_trailer_hitch
848 498 0.01 Y 10 Trailer load braked from S checkbox mdc_tlb_from
849 499 0.01 Y 10 Trailer load unbraked from S checkbox mdc_tlub_from
876 526 0.01 Y 10 Types of bed S checkbox mdc_types_of_bed
916 566 0.01 Y 10 Usage Types S checkbox mdc_usagetypes