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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.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 = 'fr' 
WHERE 
  sd.section = 'A' 
  AND sd.status = 'A' 
  AND sd.param_5 = '6' 
ORDER BY 
  sd.position

Query time 0.00055

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	sd	ALL	section				223	Using where; Using filesort
1	SIMPLE	cscart_static_data_descriptions	eq_ref	PRIMARY	PRIMARY	9	mahm3t_cs443.sd.param_id,const	1	Using where

Result

param_id	param	descr	param_5	status	position	id_path
211	index.php?dispatch=discussion.view&thread_id=1611	Témoignages	6	A	10	211
212	index.php?dispatch=pages.view&page_id=54	Prix & Livraison	6	A	15	212
213	index.php?dispatch=pages.view&page_id=53	Contact	6	A	20	213
214	index.php?dispatch=pages.view&page_id=131	Formulaire de contact	6	A	30	214