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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '815cbbb9b837ab10c48d9690968823c1b954b71c404cb40357664ca6fed14385' 
  AND token = '0RugY8kbKlx4TnbhYtj+xytagHto/CiehmL3DPlnpLM=' 
  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"
    }
  }
}