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SELECT 
  cscart_wk_vendor_custom_fields.*, 
  cscart_wk_vendor_custom_fields_description.description, 
  cscart_wk_vendor_custom_fields.profile_required as required 
FROM 
  cscart_wk_vendor_custom_fields 
  LEFT JOIN cscart_wk_vendor_custom_fields_description ON cscart_wk_vendor_custom_fields_description.object_id = cscart_wk_vendor_custom_fields.field_id 
  AND cscart_wk_vendor_custom_fields_description.object_type = 'F' 
  AND lang_code = 'es' 
WHERE 
  1 
  AND cscart_wk_vendor_custom_fields.profile_show = 'Y' 
ORDER BY 
  cscart_wk_vendor_custom_fields.position

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "10.63"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "2.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_wk_vendor_custom_fields",
            "access_type": "ALL",
            "rows_examined_per_scan": 20,
            "rows_produced_per_join": 2,
            "filtered": "10.00",
            "cost_info": {
              "read_cost": "5.84",
              "eval_cost": "0.40",
              "prefix_cost": "6.24",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "field_id",
              "field_name",
              "profile_show",
              "profile_required",
              "field_type",
              "position",
              "is_default",
              "section",
              "matching_id",
              "class",
              "autocomplete_type"
            ],
            "attached_condition": "(`marketpl_db`.`cscart_wk_vendor_custom_fields`.`profile_show` = 'Y')"
          }
        },
        {
          "table": {
            "table_name": "cscart_wk_vendor_custom_fields_description",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "object_type",
              "lang_code"
            ],
            "key_length": "12",
            "ref": [
              "marketpl_db.cscart_wk_vendor_custom_fields.field_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 2,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2.00",
              "eval_cost": "0.40",
              "prefix_cost": "8.64",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "object_id",
              "description",
              "object_type",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}

Result

field_id	field_name	profile_show	profile_required	field_type	position	is_default	section	class	autocomplete_type	description	required
21	nit	Y	Y	I	0	N	C			Nit	Y
20	socio_camara_comercio	Y	N	C	0	N	C			Es socio de Cámara de Comercio de Guatemala	N
18	DPI	Y	N	G	0	N	1			DPI (Ambos lados)	N
16	RTU	Y	N	G	0	N	1			RTU	N
15	Patente de comercio	Y	N	G	0	N	1			Patente de comercio	N
1	company	Y	Y	I	10	Y	O	company	organization	Nombre	Y
2	company_description	Y	N	T	20	Y	O	company	organization	Descripción	N
4	firstname	Y	Y	I	40	Y	C	first-name	given-name	Nombre	Y
5	lastname	Y	Y	I	50	Y	C	last-name	surname	Apellido	Y
6	email	Y	Y	E	60	Y	C	billing-email	email	Email	Y
7	phone	Y	Y	I	70	Y	C	phone	phone-full	Teléfono	Y
8	url	Y	N	I	80	Y	C	url	url	URL	N
9	fax	Y	N	I	90	Y	C	fax	fax-full	Fax	N
19	departamento	Y	Y	I	100	N	C			Departamento	Y
11	city	Y	Y	I	110	Y	C	billing-city	city	Municipio	Y
13	state	Y	Y	A	120	Y	C	billing-state	state	Zona/Residencia	Y
10	address	Y	Y	I	130	Y	C	billing-address	street-address	Dirección	Y