Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dbec0bc32126a3ad8a6ca3f2889b1118788177b946d52421f577abad0a04ad' 
  AND token = 'Y44/SmbBq/kH0dQmHCOMgHJ1nGIUQ3aT30fr8VdDTXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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