SELECT 
  c.* 
FROM 
  cscart_bm_containers as c 
WHERE 
  1 
  AND c.location_id = 39

Query time 0.00016

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
151 39 TOP_PANEL 12 Y A 0
152 39 HEADER 12 Y A 0
153 39 CONTENT 12 Y A 0
154 39 FOOTER 12 Y A 0