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SELECT 
  cscart_categories.*, 
  cscart_category_descriptions.*, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path 
FROM 
  cscart_categories 
  LEFT JOIN cscart_category_descriptions ON cscart_category_descriptions.category_id = cscart_categories.category_id 
  AND cscart_category_descriptions.lang_code = 'en' 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = 502 
  AND cscart_seo_names.type = 'c' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
  AND cscart_seo_names.company_id = cscart_categories.company_id 
WHERE 
  cscart_categories.category_id = 502 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.company_id = 1

Query time 0.00125

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows
1	SIMPLE	cscart_categories	const	PRIMARY,c_status,p_category_id,idx_category_id	PRIMARY	3	const	1
1	SIMPLE	cscart_category_descriptions	const	PRIMARY	PRIMARY	9	const,const	1
1	SIMPLE	cscart_seo_names	const	PRIMARY,dispatch	PRIMARY	210	const,const,const,const,const	1

Result

category_id	parent_id	id_path	level	company_id	usergroup_ids	status	product_count	position	timestamp	size_chart_id	is_op	localization	age_verification	age_limit	parent_age_verification	parent_age_limit	selected_views	default_view	product_details_view	product_columns	is_trash	staff_notes	action	lang_code	category	description	meta_keywords	meta_description	page_title	age_warning_message	custom_header	seo_name	seo_path
502	501	501/502	2	1	0	A	1	10	1376949600	0	N		N	0	N	0	a:3:{s:21:"products_multicolumns";s:21:"products_multicolumns";s:24:"products_without_options";s:24:"products_without_options";s:10:"short_list";s:10:"short_list";}	products_multicolumns	default	0	N			en	Decorative Stone	<p><span style="font-size:18px;"><span style="color:#FF0000;">Please click </span><a href="https://www.mystegu.pl/en/">here</a><span style="color:#FF0000;"> to design your own interior.</span></span></p> <h2>Interested in decorative tiles for interior or exterior walls?</h2> <p style="text-align: justify;">For sure you will find something special ihere. We offer wide range of gypsum and concrete tiles but also bautiful natural stones. Many designes (bricks, woodalike tiles, stone structure, geometrical shapes) and colors allows to find perfect product matched to your home design. Our tiles can be applied on interior walls, but also for exterior ones. They are frost and water resistant. Change your wall with us!</p>	wall tiles, exterior, interior tiles, tiles and corners, gypsum tiles, concrete tiles, tiles for painting, natural stone, tile adhesive, joints for tiles, frost resistant tiles, bricks, stone, wooden tiles	We offer wide range of tiles and corners - gysum, concrete, natural stone. Many colors and designes: bricks, stones, geometric shapes, gypsum panels for painting. Glues, primers, joints, impregnation available as well - check it now!	Decorative stones for interior and exterior walls \| baubay.de			decorative-stone	501