Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a4d35b0cd40734bbfeb3a722dc11c656211d56e7be9ef33f3a1c24adae818d' 
  AND token = 'rt0ePtlcaHJazumq6HDREQt8ksM4Oz6Ugt3Pf0zucSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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