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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7cfffdcb11f479dd4b8bd01a9dd0a3ec8a3c83f89d2fd3f48e6f2f1ae4cfc84a' 
  AND token = 'FoIB+0uxYdaKf00yzG0vCZAJSC/ydHajahlJzUCifo8=' 
  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"
    }
  }
}