Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bec7f706794ff7c4bcf90d9f360488f58444d3c8297cf6e5aabafecfde71cd5' 
  AND token = '+Po0TGn3oOk7KW+oMQBw4TlVx3nslmF3SY53UCz77IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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