Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ffb617869a43bdcac7c2d94f3a0f912df748d2e0d3cc6a1cc32b7041a8b7e5' 
  AND token = 'ON9Crq/awYT4zCkvuJWQIwtLyozqrLmAkBvoX7NuUYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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