SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0b88907e105c3d29a3e749fba3bb357f37992559f866d7cc417cebfb8bb8b3' 
  AND token = 'IPJEFMastSWk6jHwBmCfojCZu5derUBUe/zK5VSyX1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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