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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '852372a5dc8e33f645e6d6f256d2b6b8f48d1d86e28bbb17f6c1c619ef850646' 
  AND token = 'AhDeN6F9slpmpVLkUxRD9QBBJXfKWrNO+fD3U1TBGKo=' 
  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"
    }
  }
}