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SELECT 
  COUNT(
    DISTINCT(cscart_companies.company_id)
  ) 
FROM 
  cscart_companies 
  LEFT JOIN cscart_company_descriptions ON cscart_company_descriptions.company_id = cscart_companies.company_id 
  AND cscart_company_descriptions.lang_code = 'tr' 
  LEFT JOIN cscart_absolute_rating AS absolute_rating ON absolute_rating.object_id = cscart_companies.company_id 
  AND absolute_rating.object_type = 'company' 
  LEFT JOIN cscart_vendor_plan_descriptions ON cscart_companies.plan_id = cscart_vendor_plan_descriptions.plan_id 
  AND cscart_vendor_plan_descriptions.lang_code = 'tr' 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = cscart_companies.company_id 
  AND cscart_seo_names.type = 'm' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'tr' 
  LEFT JOIN cscart_discussion ON cscart_discussion.object_id = cscart_companies.company_id 
  AND cscart_discussion.object_type = 'M' 
  LEFT JOIN cscart_discussion_posts ON cscart_discussion_posts.thread_id = cscart_discussion.thread_id 
  AND cscart_discussion_posts.status = 'A' 
  LEFT JOIN cscart_discussion_rating ON cscart_discussion.thread_id = cscart_discussion_rating.thread_id 
  AND cscart_discussion_rating.post_id = cscart_discussion_posts.post_id 
WHERE 
  1 
  AND cscart_companies.status = 'A' 
  AND cscart_companies.company_id IN (3, 4)

Query time 0.00256

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	absolute_rating	system	PRIMARY				0	const row not found
1	SIMPLE	cscart_companies	range	PRIMARY	PRIMARY	4		2	Using index condition; Using where
1	SIMPLE	cscart_seo_names	ref	PRIMARY,dispatch	PRIMARY	206	hobilifedt.cscart_companies.company_id,const,const,const	1	Using where; Using index
1	SIMPLE	cscart_discussion	eq_ref	object_id	object_id	6	hobilifedt.cscart_companies.company_id,const	1	Using where
1	SIMPLE	cscart_discussion_posts	ref	thread_id,thread_id_2	thread_id	3	hobilifedt.cscart_discussion.thread_id	1	Using where

Result

COUNT(DISTINCT(cscart_companies.company_id))
1