Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f47a9369b559d54091d16d0e518ed9248c4d5b2ce95629a97f22e5b28dfef6' 
  AND token = 'Ng9FzKTTKjnMuWdecjwqeLM+bMXm3fDrxZ0PxlyPqy0=' 
  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"
    }
  }
}