Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '76b295534ee9a364b2418f22053d299b621ce524324c09dd9b79e8a2162c7a12' 
  AND token = 'hB2G5FkxyV/99HSo2H71zdSQPWWYPge99XvT6CPZyfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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