Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662b964d1e534fb43f150cb06c7339af5f492d261e49573f47de1ecb0ecd221a' 
  AND token = 'QpDYS+I6H1zMEWtEK+jn0ACtDLesVRsWfujyBICF5nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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