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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30e29a06a309f7f1d47b962d97929613cdcb9c3395d76049bcbf550cfda2112' 
  AND token = 'avxQaZDv886MfYuRd5rBmF2NejQcWrvDRT52hJqC19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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