Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15608328be9200344de5655f7e7925240d58fa7b93625d28beb27a039a3b3498' 
  AND token = 'kvdys5Zyx6MUp8rn0Yzmgs9MmZAf51tyumZz3iX2zjo=' 
  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"
    }
  }
}