SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fc63617e511ccb63f8b15af5c8daf25bb529224d4325b641ec86ae4b08fdad' 
  AND token = '5IX6+vk0HpHgY1LAKkDLp6eMBPCsmqx8jCEPQ/Xx+/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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