Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fef91451ca7ddb93fedd42056037428bf28a3a641f2e3196872bae830ee4a9' 
  AND token = 'n292oh0f1T4mNFsYx2r+U8LF1m37oqK9Tq1zswDIyC8=' 
  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"
    }
  }
}