SELECT 
  c.* 
FROM 
  cscart_bm_containers as c 
WHERE 
  1 
  AND c.location_id = 4

Query time 0.00030

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE c ref location_id,location_id_company_id,location_id_position_company_id location_id 3 const 4

Result

container_id location_id position width user_class linked_to_default status company_id
13 4 TOP_PANEL 16 Y A 0
14 4 HEADER 16 Y A 0
15 4 CONTENT 16 content-grid Y A 0
16 4 FOOTER 16 Y A 0