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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e574b9d1c13d96eab9b8219377e478a078a7b67f7f669b21eb4ee23492d7049' 
  AND token = 'WX6CPAOXaXEckLEpJaZVKyATX6jP7LxvPr23rPrNGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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