Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0528c771623d05f3e6b2071b4bc52c205fc34eb63d61210f7c4add1cccfba77' 
  AND token = 'JOBNAGNMTKfGsru5ZMD/RjynmGrbDjDRjHObL1OKfdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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