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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11549d45c940bbec1ae0ee18b52722edb0a5dc57d769d12cddac711b8b6fd7d9' 
  AND token = 'BbpGZGGnSZ75jBUk9yBPT5w6PWQ0YlNQRMGICjJW4Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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