Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb927547aa30682645428245533291fd70a198b2296181677e6245afee3d9808' 
  AND token = 'bdlhYXNPqfmMoF6Fg3HglwR6xnxQSPlxC19qRpPy0bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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