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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b8c33cc8e6e34ba90ee600ea6f7c0cf590f1a74e9834ce4fb078368ae874ac48' 
  AND token = 'zj8eAgvzHuD6XRktFUORKVp6sYLvLWyRDWEjXuO02kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}