Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e475dc5052478b85da1d920d4a0fc3ec4414f4d6dd38e7c0111defbcdab6ec2' 
  AND token = 'cJrWI27v743fcCfPgwg+jH67CoR1AxM0GcfW+f9JXLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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