Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b3c6cc1a194ac0131ad78b816ebb3ef3936649f5a80a2831f1a9fef08a426d' 
  AND token = 'GtXg/E4PO9CRSEdcC24uYkHNO68S0kXtt2YqJ/qhctE=' 
  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"
    }
  }
}