Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d494794c1779c372ee2c70332ec7a131b830d5a3f86ac8262309211a05ebc8d' 
  AND token = 'cK4ieoMCEP/ndOBObT6zw/MPO8lKUMbwfN8HDZdZD1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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