Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae846b528938330e0304511f14d71b974f512099c523da6977a0886e15c45bff' 
  AND token = 'f4u/H3ii34q7jvmEN2PZjugg3Rp6uqqI0r8eu+PHqcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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