Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc9af825f8c08983802c81aba16489f96ffb4c2eafee00c55bbb45e7c999895' 
  AND token = '7qiEWQtn3+0/ftqAKE0QRPeN2P70j0EXnhvstATxIWg=' 
  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"
    }
  }
}