Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7f032271396a5eb4f04015888810e5ec2bd6131d10832d4c67e15782985378' 
  AND token = 'UIjmLKgviaou4QrGKW+4GMnCnt2YzW0vI7vo3MkHzkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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