SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04c4f33cb457e32e32a904dd210a8c9a906c8adf40bd5ff98b4c7e8b43a72bd' 
  AND token = 'RJhRp5m2CjEYdf+581IHs6LAWAzzxffVgRj0XGwBYx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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