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SELECT 
  sd.param_id, 
  sd.param, 
  cscart_static_data_descriptions.descr, 
  sd.param_2, 
  sd.param_3, 
  sd.param_4, 
  sd.param_5, 
  sd.param_6, 
  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 = 'en' 
WHERE 
  sd.section = 'A' 
  AND sd.status = 'A' 
  AND sd.param_5 = '4' 
ORDER BY 
  sd.position

Query time 0.00044

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	sd	ALL	section				22	Using where; Using filesort
1	SIMPLE	cscart_static_data_descriptions	eq_ref	PRIMARY	PRIMARY	9	cscart_dev_4_16.sd.param_id,const	1	Using where

Result

param_id	param	descr	param_2	param_3	param_4	param_5	param_6	status	position	parent_id	id_path	class
175	index.php?dispatch=pages.view&page_id=22	Delivery and payment				4		A	0	0	175
176	index.php?dispatch=pages.view&page_id=21	Returns				4		A	0	0	176