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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '355083c491b834d550e2ffa051b17bbc7ae86b8b9d6dfc1ba5b88b62ed2d4845' 
  AND token = '9dPJ93sc+eg9bKRA49m9sD61rLX6LuUv0fliYrmynmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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