Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fef9cea21e779dedf1919b5ae13a2321d40be89f56c5fcb1a73ed9f86a5f1b7' 
  AND token = '7xbZYAUNWGWJ5aPBswdPaXXmyH9bl0j9gwx3llwHbnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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