Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9de2587f985f43b85fc4251e8f5c7ee28dd1992479f57d2f6e7a023a55f748' 
  AND token = 'zQWJk9yy2wStBkxEFr9UyvUOxASmzvII+b9CiP/0joc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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