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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3cad74042f5469cbb5be4adff08b4b9654824c6e97f8dd03603ecbf70bf74684' 
  AND token = 'rSg4IAUtI6Q3+LvTJs9vYi2xG9qFpcv+JPvkgoXUTvQ=' 
  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"
    }
  }
}