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SELECT 
  cscart_profile_fields.*, 
  cscart_profile_field_descriptions.description, 
  cscart_profile_fields.profile_required as required 
FROM 
  cscart_profile_fields 
  LEFT JOIN cscart_profile_field_descriptions ON cscart_profile_field_descriptions.object_id = cscart_profile_fields.field_id 
  AND cscart_profile_field_descriptions.object_type = 'F' 
  AND lang_code = 'en' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = cscart_profile_fields.field_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'profile_fields'
  ) 
WHERE 
  1 = 1 
  AND cscart_profile_fields.profile_type = 'U' 
  AND cscart_profile_fields.profile_show = 'Y' 
  AND cscart_profile_fields.field_type != 'E' 
ORDER BY 
  cscart_profile_fields.position

Query time 0.00155

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_profile_fields.position",
        "table": {
          "table_name": "cscart_profile_fields",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY", "profile_show"],
          "rows": 31,
          "filtered": 83.87096405,
          "attached_condition": "cscart_profile_fields.profile_type = 'U' and cscart_profile_fields.profile_show = 'Y' and cscart_profile_fields.field_type <> 'E'"
        }
      }
    },
    "table": {
      "table_name": "cscart_profile_field_descriptions",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "12",
      "used_key_parts": ["object_id", "object_type", "lang_code"],
      "ref": ["rfswire_cart.cscart_profile_fields.field_id", "const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_profile_field_descriptions.object_type = 'F' and cscart_profile_field_descriptions.lang_code = 'en')"
    },
    "table": {
      "table_name": "cscart_ult_objects_sharing",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "159",
      "used_key_parts": [
        "share_object_id",
        "share_company_id",
        "share_object_type"
      ],
      "ref": ["rfswire_cart.cscart_profile_fields.field_id", "const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_ult_objects_sharing.share_object_id = cscart_profile_fields.field_id and cscart_ult_objects_sharing.share_object_type = 'profile_fields'",
      "using_index": true
    }
  }
}

Result

field_id	field_name	profile_show	profile_required	checkout_show	checkout_required	partner_show	partner_required	field_type	position	is_default	section	matching_id	class	autocomplete_type	profile_type	description	required
6	firstname	Y	Y	N	N	N	N	I	20	Y	C	0	first-name	given-name	U	First name	Y
7	lastname	Y	Y	N	N	N	N	I	30	Y	C	0	last-name	surname	U	Last name	Y
8	company	Y	N	Y	N	N	N	I	40	Y	C	0	company	organization	U	Company	N
9	phone	Y	Y	N	N	N	N	I	50	Y	C	0	phone	phone-full	U	Phone	Y
15	s_firstname	Y	N	Y	Y	N	N	I	90	Y	S	14	shipping-first-name	given-name	U	First name	N
14	b_firstname	Y	Y	Y	Y	Y	Y	I	90	Y	B	15	billing-first-name	given-name	U	First name	Y
16	b_lastname	Y	Y	Y	Y	Y	Y	I	100	Y	B	17	billing-last-name	surname	U	Last name	Y
17	s_lastname	Y	N	Y	Y	N	N	I	100	Y	S	16	shipping-last-name	surname	U	Last name	N
31	s_phone	Y	N	Y	N	N	N	I	107	Y	S	30	shipping-phone	phone-full	U	Phone	N
30	b_phone	Y	Y	Y	N	Y	N	I	107	Y	B	31	billing-phone	phone-full	U	Phone	Y
19	s_address	Y	N	Y	Y	N	N	I	110	Y	S	18	shipping-address	street-address	U	Address	N
18	b_address	Y	Y	Y	Y	Y	Y	I	110	Y	B	19	billing-address	street-address	U	Address	Y
20	b_address_2	Y	N	Y	N	Y	N	I	120	Y	B	21	billing-address-line2	address-line2	U	Address	N
21	s_address_2	Y	N	Y	N	N	N	I	120	Y	S	20	shipping-address-line2	address-line2	U	Address	N
22	b_city	Y	Y	Y	Y	Y	Y	I	130	Y	B	23	billing-city	city	U	City	Y
23	s_city	Y	N	Y	Y	N	N	I	130	Y	S	22	shipping-city	city	U	City	N
27	s_country	Y	N	Y	Y	N	N	O	140	Y	S	26	shipping-country	country	U	Country	N
26	b_country	Y	Y	Y	Y	Y	Y	O	140	Y	B	27	billing-country	country	U	Country	Y
24	b_state	Y	Y	Y	Y	Y	Y	A	150	Y	B	25	billing-state	state	U	State/province	Y
25	s_state	Y	N	Y	Y	N	N	A	150	Y	S	24	shipping-state	state	U	State/province	N
29	s_zipcode	Y	N	Y	Y	N	N	Z	160	Y	S	28	shipping-zip-code	postal-code	U	Zip/postal code	N
28	b_zipcode	Y	Y	Y	Y	Y	Y	Z	160	Y	B	29	billing-zip-code	postal-code	U	Zip/postal code	Y
37	b_purchase-order-no	Y	N	Y	N	N	N	I	180	N	B	38			U	Purchase Order Number	N
38	s_purchase-order-no	Y	N	Y	N	N	N	I	190	N	S	37			U	Purchase Order Number	N
39	b_partial-ship	Y	N	Y	N	N	N	C	200	N	B	40			U	Partial Ship OK	N
40	s_partial-ship	Y	N	Y	N	N	N	C	200	N	S	39			U	Partial Ship OK	N