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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64be9de972fbf10be7d3a69b94762ebef09c3d55b105c9f70d60231792e3642' 
  AND token = 'QV8zvAjL3Be9tTazSQ/FOnJfqtFuQQ7JHHjVPBefHqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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