SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ff2f42bd695e29a3b641e807538fb46e072789ff5eae59c8bf912b83b9d483' 
  AND token = 'UzkBmhdAmGGqNwydBu0qn73J0VeOJU58/U2dt6Q/gRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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