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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cc6559d11ec564f70381f7e2dee3d305bf8e80dd4f7f0a3a8dbec23f939945dd' 
  AND token = 'W3hckZzqw8jvr5S2MVlMNmad4QtJeH1irfctzteheNQ=' 
  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"
    }
  }
}