Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047973fb5c144e99d969100e0d27f2202f840888eae8e4e6a59612edd9b8b54e' 
  AND token = 'RiyAkV4gvDmy61M2BoBd/9qyHIbO/zPWwQKMLr+9Isw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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