SELECT 
  cscart_settings_objects.object_id as object_id, 
  name, 
  section_id, 
  section_tab_id, 
  type, 
  position, 
  is_global, 
  cscart_settings_objects.name as description, 
  (
    CASE WHEN storefront_values.object_id IS NOT NULL THEN storefront_values.value ELSE cscart_settings_objects.value END
  ) AS value 
FROM 
  cscart_settings_objects 
  LEFT JOIN cscart_settings_vendor_values AS storefront_values ON storefront_values.object_id = cscart_settings_objects.object_id 
  AND storefront_values.storefront_id = 1 
  AND storefront_values.company_id = 0 
WHERE 
  1 
  AND section_id = 669 
  AND (
    FIND_IN_SET(
      'STOREFRONT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ROOT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'MVE:STOREFRONT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'MVE:ROOT', cscart_settings_objects.edition_type
    )
  ) 
  AND cscart_settings_objects.type <> 'H' 
ORDER BY 
  cscart_settings_objects.position

Query time 0.00066

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "41.04"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_settings_objects",
            "access_type": "ref",
            "possible_keys": [
              "section_id"
            ],
            "key": "section_id",
            "used_key_parts": [
              "section_id"
            ],
            "key_length": "4",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 18,
            "rows_produced_per_join": 16,
            "filtered": "90.00",
            "index_condition": "(`webmarco`.`cscart_settings_objects`.`section_id` <=> 669)",
            "cost_info": {
              "read_cost": "18.00",
              "eval_cost": "3.24",
              "prefix_cost": "21.60",
              "data_read_per_join": "12K"
            },
            "used_columns": [
              "object_id",
              "edition_type",
              "name",
              "section_id",
              "section_tab_id",
              "type",
              "value",
              "position",
              "is_global"
            ],
            "attached_condition": "((find_in_set('STOREFRONT',`webmarco`.`cscart_settings_objects`.`edition_type`) or find_in_set('ROOT',`webmarco`.`cscart_settings_objects`.`edition_type`) or find_in_set('MVE:STOREFRONT',`webmarco`.`cscart_settings_objects`.`edition_type`) or find_in_set('MVE:ROOT',`webmarco`.`cscart_settings_objects`.`edition_type`)) and (`webmarco`.`cscart_settings_objects`.`type` <> 'H'))"
          }
        },
        {
          "table": {
            "table_name": "storefront_values",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "storefront_id",
              "company_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "company_id",
              "storefront_id"
            ],
            "key_length": "11",
            "ref": [
              "webmarco.cscart_settings_objects.object_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 16,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "16.20",
              "eval_cost": "3.24",
              "prefix_cost": "41.04",
              "data_read_per_join": "388"
            },
            "used_columns": [
              "object_id",
              "company_id",
              "value",
              "storefront_id"
            ]
          }
        }
      ]
    }
  }
}

Result

object_id name section_id section_tab_id type position is_global description value
8328 et_product_link 669 670 S 10 N et_product_link both
8330 et_mv_menu_setting_new 669 670 C 30 N et_mv_menu_setting_new Y
8331 et_mv_menu_setting_sale 669 670 C 40 N et_mv_menu_setting_sale Y
8332 et_mv_menu_setting_best 669 670 C 50 N et_mv_menu_setting_best Y
8333 et_mv_menu_setting_about 669 670 C 60 N et_mv_menu_setting_about Y
8334 et_mv_menu_setting_pages 669 670 C 70 N et_mv_menu_setting_pages Y
8335 et_mv_menu_setting_contact 669 670 C 80 N et_mv_menu_setting_contact Y
8337 et_vendor_filters 669 670 S 100 N et_vendor_filters vertical
8338 et_vendor_categories 669 670 S 110 N et_vendor_categories collapsed
8340 tpl_colors 669 670 E 130 N tpl_colors colors.tpl
8341 vendor_colors 669 670 D 140 N vendor_colors a:7:{s:10:"header_bkg";s:7:"#ffffff";s:11:"header_text";s:7:"#000000";s:12:"header_hover";s:7:"#ffffff";s:8:"menu_bkg";s:7:"#ffffff";s:9:"menu_text";s:7:"#000000";s:14:"menu_bkg_hover";s:7:"#000000";s:15:"menu_text_hover";s:7:"#ffffff";}
8343 plans_page_settings 669 670 E 160 N plans_page_settings plans_page_settings.tpl
8344 vendor_plans 669 670 D 170 N vendor_plans a:10:{s:14:"highlight_text";s:7:"#00ccdf";s:9:"price_bkg";s:7:"#00ccdf";s:10:"price_text";s:7:"#ffffff";s:8:"best_bkg";s:7:"#62ba00";s:9:"best_text";s:7:"#ffffff";s:14:"best_outer_bkg";s:7:"#ff9900";s:15:"best_outer_text";s:7:"#ffffff";s:11:"show_footer";s:2:"on";s:11:"footer_text";s:7:"#ffffff";s:10:"footer_bkg";s:7:"#01d1f5";}