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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '69c4e709b71d9781dd0c1b07dadf4a0214b96f07145481d941d8ca5f1f7e6d13' 
  AND token = 'H6DEjrMiL8r3CA6UIYlPeciFVSWScUjQsy6uEaHRtio=' 
  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"
    }
  }
}