Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d021061eca1ff0c8e60ca595bee5f55f4944ac2020c3e2b5aa6edb16c2de8d1' 
  AND token = 'ADxEVzxpIOe/Daxj2LMptZH7XvxNQfsp5g5wpYKiQsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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