Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b08b1dbf598d0d5dd9ac4f2be1c43a155bde5fe8448a4c997bd5e3916e5f20' 
  AND token = 'pk7Qo95hDg7Gs38GpYCbQ3jyB28jaZ6ZO1+55C9VIcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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