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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632681d0d9fd1d8bd6cf56d1b9c63d29feabf7bd1e2295d057f9d10ff4718a52' 
  AND token = 'VJ5tpK0ZlMqbWRkxwE6Xgwb83JmuswLY1+Hb2hKOa7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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