Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcb4613bc4527a2bb791bb4c5c5bc9fadd392acfc7e14ff0c0f9954a1c5ac7e' 
  AND token = '93xmfaAzeDo2V7nm36lWNjscDmXMyzmRzcO/jiVXOsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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