Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8edfe8cc288ef37b4ccf065c0e13384afc9a66f6a72a5523c837ef1cfa63e3' 
  AND token = '/SckGCT8UpFXT0fBje8dII42vg+xCPRif9o7g1DlS/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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