Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4943fdc0d6a983634f7df7acb1198f32ad5d32c5185d2a43af89ab9efbe1018d' 
  AND token = 'i6IeEVzt8hTT/iiVDL3wZ8nA/mvYSQQy3VyTQDiWNtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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