SELECT 
  * 
FROM 
  cscart_csc_meta_templates_list 
  LEFT JOIN cscart_csc_meta_templates_schemas ON cscart_csc_meta_templates_schemas.meta_id = cscart_csc_meta_templates_list.meta_id 
  AND cscart_csc_meta_templates_schemas.lang_code = 'en' 
WHERE 
  1 
  AND cscart_csc_meta_templates_list.object_type = 'products' 
  AND cscart_csc_meta_templates_list.mode = 'R' 
  AND cscart_csc_meta_templates_list.status = 'A' 
ORDER BY 
  cscart_csc_meta_templates_list.position desc

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "19.10"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "16.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_csc_meta_templates_list",
            "access_type": "ALL",
            "rows_examined_per_scan": 10,
            "rows_produced_per_join": 1,
            "filtered": "10.00",
            "cost_info": {
              "read_cost": "1.15",
              "eval_cost": "0.10",
              "prefix_cost": "1.25",
              "data_read_per_join": "248"
            },
            "used_columns": [
              "meta_id",
              "position",
              "name",
              "mode",
              "override_filled_meta",
              "object_type",
              "conditions",
              "company_id",
              "timestamp",
              "status"
            ],
            "attached_condition": "((`cscart_db`.`cscart_csc_meta_templates_list`.`object_type` = 'products') and (`cscart_db`.`cscart_csc_meta_templates_list`.`mode` = 'R') and (`cscart_db`.`cscart_csc_meta_templates_list`.`status` = 'A'))"
          }
        },
        {
          "table": {
            "table_name": "cscart_csc_meta_templates_schemas",
            "access_type": "ALL",
            "rows_examined_per_scan": 16,
            "rows_produced_per_join": 16,
            "filtered": "100.00",
            "using_join_buffer": "hash join",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "1.60",
              "prefix_cost": "3.10",
              "data_read_per_join": "384"
            },
            "used_columns": [
              "meta_id",
              "lang_code",
              "schema"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_csc_meta_templates_schemas), ((`cscart_db`.`cscart_csc_meta_templates_schemas`.`meta_id` = `cscart_db`.`cscart_csc_meta_templates_list`.`meta_id`) and (`cscart_db`.`cscart_csc_meta_templates_schemas`.`lang_code` = 'en')), true)"
          }
        }
      ]
    }
  }
}