Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8779f52ebfc1e3c323f9e486919ff4e32392099d044c915c3623f9460d6d00' 
  AND token = '6mXOjM8bUeXMF1TJ8chkkRzmz/g8Rigk7WY37BhuDVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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