Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc183139f12079e3f3a8d05c74ebf25d3631c6ee7a5ca2954cccd9908c35a4' 
  AND token = 'YvKqEEJ2xi9GNKfd3Xjgvnl669xmoKLCAL9eOdofjYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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