Sandbox

SELECT 
  sidebar_c_bg as 'bg', 
  sidebar_c_title as 'title', 
  sidebar_c_desc as 'desc', 
  sidebar_c_link as 'link', 
  sidebar_c_link_text as 'link_text' 
FROM 
  cscart_categories 
WHERE 
  category_id = 1343

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}