Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c4e05a9100224b9b7d6d30b9e9838135c5dcbda9e04e3b40c517aeb2423da2' 
  AND token = '8UmIz3nxHzGlQosI87RXc9wa1aIRKsO/Kjg3CFTpKsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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