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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1f46b50e9cafb1a69fc171cf5750ed17ef4d51d62e54b86e54ba4662b14465' 
  AND token = 'rg+Ulx2IAJ8eB5UIdJNjbIuhfVIPkXEzcJsNu0Kq9CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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