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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd08a3f0144fde7b0d0880fd292f5d40c6991aadb61b4bcd0c3a615025cbbff38' 
  AND token = 'YSva0TheqcQsFUC5fOKun6qBPcMFe5/uw6WNb8ni6iM=' 
  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"
    }
  }
}