Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7dffdcb4e2939826a6fe1728716b7bb5e8d1b67a461f0007ff4bcefa307fa8' 
  AND token = 'S/PGAtCakehcceSLAj5MvAKaoo8SurtU7upnvcBryDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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