Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b021aac2b1795d05ebb6344aec91fa78ffb7d26851d309e0ca04e95aeaeefb3' 
  AND token = '+4LtPOOQKS5FI3AzqnrWlSp6gr4eNYvmxCQqqFBsLeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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