Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f537a4b7f80fbe5b3ce3e0095ef91cb7d47a19f47f63fcbf4f70c52058a937' 
  AND token = 'IUxf3FT434Jb9+mdXckL/t5pfw+UZ1uGDYVNAxLOZ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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