SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e9fc2d68d9462b799059838ce0c23b095065ccaad565501730ff403a25ba4418' 
  AND token = 'tteL6LMAWCpRrhxwUDwWtyj3rVyZPckOsMzV5mH+Uno=' 
  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"
    }
  }
}