SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ae8710a8d13e07b939f82f05ccb51cb3641fd1ac00deddd59845233ff059f7' 
  AND token = 'NuijJwa6qiIo8gF0s9jvk2nVXF0/zRL5+VMAojivwq4=' 
  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"
    }
  }
}