Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47238b82c316747259944d7cb25c57cd8a8b254ef6a2c4a97bfa88c0051d831' 
  AND token = 'gu8NeKyU/rtlsh5mF/dg1x/LljRo0gXWyVI37NWLdEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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