Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f1e074df3f4519db5e5386a85dcab990bee55a49d4a56e663fc4c9bbc8e5b9' 
  AND token = 'GYO5VvP1q1mccrhdysxwaxgD1w078Xc13eyX4JWRcxA=' 
  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"
    }
  }
}