Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dde6c9408f13fa40dd2fc3eeefbab6b715ee5cc4e6a8099179d064c061cec2a' 
  AND token = 'bkn2xl2EvOPuhBGUiEUp/bkxnL18KhE7w19DHiUqSbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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