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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6cab92c214a518f6ace78abeb365da76ef1a138ea24c5cc2fdf8e8f2850955' 
  AND token = '04h5fK0DB/k1901/ytf2qDXjhOwsE/X6PuOmlfONalg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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