Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ac8f2a1fe4179a4bc1a11642aed24ae99d9174eeb2fd06a42e74775b1334a5' 
  AND token = 'uH+nq6iYrTyJpJLiv5sQeFEq1vWpwF+PRWOBU5OBrZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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