Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8ecf80a5ede8071a7b0bf7e25d3357e0ad9704db95286c4c448303bc0dd440' 
  AND token = 'fhFpT9e5n0AnBAJwNqTcwKA6lUU+6lKJX4WOmyr3fvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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