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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e680390f622b5688129ed8d32de1a5f9df36ddf95d7b073d2cd1df60008f006f' 
  AND token = 'neR0KGvoDLiBs8OkAWBIvIVxJvJWcHvwm9TtFULlJv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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