Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5a08b9c4cf75600da05a10ded0a6ed207efde924150ca47a14c6b74ff156c6' 
  AND token = 'dMNQRVPQ5JLudMNUEVNMLXHGRiU5IJ98mRecGrPC1WE=' 
  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"
    }
  }
}