Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd393973b9ddce1ba3ab72d29702f221d71a0276f91e469eb0ebfc85eab30b85d' 
  AND token = 'guFSFXFI5JOyy7TRgEykM8z0f+cYUNoeyJR6QNB7SCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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