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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '14853d1496601ed50bcb8344dd50f33914b6fe625026903d319faf9f00a2a5f4' 
  AND token = 'aPrmt21MQQ9Qy6Bgi/WAZDV3kj+Je7QMFo6wPxeuxyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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