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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0adf91e2336a3f4c5fc95c2a93e0db9eaa11d8aca845c4f75bdff2a46aad3fde' 
  AND token = 'D5ggUTtDptc7iVjSbeJlzxeDmWsv64m+9v1ExHGP/K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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