Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29f61ba73ced05fb05a5a76c4de2a4523af136132758ec2921fe697c2f3db91' 
  AND token = 'kpfPF/oOXDEvfuhNuEUFljPtGd6y0nXeRP0U5npKyo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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