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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd069567995f03eedd8419152eb0bd57aabf3ebd4bbef2cad0fc7a08a7ba6805' 
  AND token = '7T4O9eXwKIlOc7Gs3PRNR7t/1raO3sh8lf5hmzTQvuE=' 
  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"
    }
  }
}