SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f76e0291b755e8e0a15f1d81362c7423a125e167d5653f875c1c08eca8adcd' 
  AND token = 'pra6+/PaDB6b3SgpOKqBuIgWGIOVhYW330wPhGH+kIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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