Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c9299d6055726e959a9693ff3a66fa8353865595adb8f32a25869be327354e' 
  AND token = '6nEiQypOgPvm0/Gqk0c4y4ajTF4kiRoP5NkFwirqvyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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