Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2594b9afa5aaeb81a3fa5ca687dbe95ba145fb8a7dc6111419862b354b7a2ee' 
  AND token = 'PILjM73CdBTskmcWdiLy4WUYGsgX82+J3qDOa8f+R2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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