Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc7ea6381c3c8ab04a108ed7e043a4ffaeadfd47881e7cb01e12b3c07424d1e' 
  AND token = 'HETzg9qzPo5YkrqmwKksjNdiTwao/AMo/278aGOQS2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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