SELECT 
  sd.param_id, 
  sd.param, 
  cscart_static_data_descriptions.descr, 
  sd.param_2, 
  sd.param_3, 
  sd.param_4, 
  sd.param_5, 
  sd.status, 
  sd.position, 
  sd.parent_id, 
  sd.id_path, 
  sd.class 
FROM 
  cscart_static_data AS sd 
  LEFT JOIN cscart_static_data_descriptions ON sd.param_id = cscart_static_data_descriptions.param_id 
  AND cscart_static_data_descriptions.lang_code = 'ru' 
WHERE 
  sd.section = 'A' 
  AND sd.status = 'A' 
  AND sd.param_5 = '2' 
ORDER BY 
  sd.position

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "15.20"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "sd",
            "access_type": "ref",
            "possible_keys": [
              "section"
            ],
            "key": "section",
            "used_key_parts": [
              "section",
              "status"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "const"
            ],
            "rows_examined_per_scan": 30,
            "rows_produced_per_join": 3,
            "filtered": "10.00",
            "index_condition": "((`db_emaika1`.`sd`.`section` <=> 'A') and (`db_emaika1`.`sd`.`status` <=> 'A'))",
            "cost_info": {
              "read_cost": "5.60",
              "eval_cost": "0.60",
              "prefix_cost": "11.60",
              "data_read_per_join": "16K"
            },
            "used_columns": [
              "param_id",
              "param",
              "param_2",
              "param_3",
              "param_4",
              "param_5",
              "class",
              "section",
              "status",
              "position",
              "parent_id",
              "id_path"
            ],
            "attached_condition": "(`db_emaika1`.`sd`.`param_5` = '2')"
          }
        },
        {
          "table": {
            "table_name": "cscart_static_data_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "param_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "db_emaika1.sd.param_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "3.00",
              "eval_cost": "0.60",
              "prefix_cost": "15.20",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "param_id",
              "lang_code",
              "descr"
            ]
          }
        }
      ]
    }
  }
}