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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529065b8c50d122cfb1e55d6f03859ed05e8af69ddcd3d96d303a226174efb47' 
  AND token = 'ZQF+DH9Jf12n3yp6N1xTuQT/H+xCnd3d5e6HTWuWv00=' 
  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"
    }
  }
}