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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'db6fc7675718e381cf3e9817f8bdc97c6fe245941c5c74a17fd6dc97789785b7' 
  AND token = 'r9FkOgcC3iDKhrdB4DcJcV+hUlzECoQ4y+ubJrbuv5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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