Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d44334f27c5b7c12bcd3adcd540f423cf12d312e6b47cf0e792ee9be7d1a0c' 
  AND token = 'iUIHXmX2/hX+62yV2FmWhXKOT8e/h1K8AOY/B4/91V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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