Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf795054e1ffa21aee660c9a22df000ce0390020a242ee5be7dc7731517b142' 
  AND token = 'gR4KOcP3a0hBsv5Ei/QMXi62abgg93qU+YNW5eLaplM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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