SELECT 
  IFNULL(position, 0) 
FROM 
  cscart_cp_video_product_links 
WHERE 
  video_id = 287 
  AND product_id = 17245 
  AND type = 'T'

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}