Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9277c81327c40bc93441f7689bcd4560eddeffb1f125125b9da2aa8d51e649' 
  AND token = '1/dksJ0ypmSFh28DpE4yAkDzza8sOR7EBcWSSe0em2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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