Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0d0bc51411e88e882ba5b8edb7d263a89f3fab2770e03218d51a3d8c069148' 
  AND token = '/x+0Gj0KyfRrtHFJJFZ1PyD+M9IoXBs6AOOfR5ycxr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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