Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b5367cc6df117c33998e7fb62e5cb85e12ddf36e75bdf4d9c350fd434f56c1' 
  AND token = 'UWiLUysQ25+/FNb5WOG1VB8pwCIdMZbm5RdLtGCa2EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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