Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21c525b8a500f57b62cdece3ab790ddcd58f79e089661248784c5a0271ea7da' 
  AND token = 'SgaICMgZe7jiKwYoLcgnMCGhrZ+6rgtClyT4TMCtmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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