SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a56a30da5e5b26ccbb77e742212029172fe0f330af63bf86b49296e14e807c7' 
  AND token = 'MqnLFEpr6uNFQDYophKfiTLJdYihKuQXBBj7krW4u/g=' 
  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"
    }
  }
}