SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1f81fb674d9e4234445648596833f16e6b2c131ab35482238d752ae24d1bcb76' 
  AND token = 'vOmALyp00iWBmgMqslZj1MVOxkSyHg9Dt27bghm8KaQ=' 
  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"
    }
  }
}