Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f833a6388e7e2dedb6ee3d9464d0ec71dfaa288dc185cec6317439ca8376fa' 
  AND token = 'HBdouNrrSJnp8lQE8yBmFURndgVqKVVmtIj3t1T4qnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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