Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38311dcebee164a0652311071a18b13f6fa242614b2f56a2acd2da21090b435' 
  AND token = 'A2OsRewIiEomqKx+YYoTjOUFX7zJzKcTXI2D2s/ZRXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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