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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556c790dfdf1bd6e7bfa40659b385cc300f11696769b1883f2f2f67aad6ebf21' 
  AND token = 'T/1vXt5F9XrDpxbpZemMW3XgfuojvvAn37IUthQueH0=' 
  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"
    }
  }
}