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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e7bff66a4a76eb54f1ddd183e705ffce54515240b6cb48975bd42bd21b7de6' 
  AND token = 'iKs7u+rGtXwYkhM+WyPbhbLLk7j7mBIj5WXsXmlvFa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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