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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cf7accf7cbd2d234457f61646ce0f3a8ccd74c650ce4981d1881e64c0ea0485a' 
  AND token = '8dy+LFUKRqw6bp79ijM1YuIRvKc4lkbFjwmMwjuM9z8=' 
  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"
    }
  }
}