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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '69c2ce3b7891b23571dd4c28c833ae83197a5868935d05741c375aecd7f735c8' 
  AND token = 'NpQrbDzghtoSANA9lz17++uC8WDcUx2zJRFZK33szro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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