Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4820f0e170be8830d25335c1338131a207d8ed4b67c7bf640784d597bcf5f170' 
  AND token = 'mWifufsnhrw58HbCxDhObHfXNTWIn7xiqA/MmKfzNW4=' 
  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"
    }
  }
}