Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa86c51abc98c75c7a4fdc1e4c7810cd4de918eab42f676dd224bbd1e9f4304' 
  AND token = 'OGRZwQ/ltylJ0PfASVngfLvSMQgRFOs4IJ9z+r6S+I0=' 
  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"
    }
  }
}