Sandbox

SELECT 
  redirect_id, 
  src, 
  type, 
  object_id, 
  dest, 
  lang_code 
FROM 
  cscart_seo_redirects 
WHERE 
  src = '/computers/tablets/nokia-n1-pad-7-9-quad-core-64bit-2-3ghz-2gb-32gb-android-5-0'

Query time 0.00043

JSON explain

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