SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda066316a17d271ef81e68afb64921c8f5b54c2c93a0ec997a34e4c2f4a94d9' 
  AND token = '4hLDsBoHNVI4lXTK+5C8LIJVOGaYIWzz3k8wAworPAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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