Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cd6e7c2ad7636ccede0a3e95a0056874d28970aa387b8afdc7e0d3f31dba42' 
  AND token = '1/EQRmD1kR+vZLKUnlmYiBW4+I/f7Hq6CFznaEv1slY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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