Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4556077de7d5bb21b9df0c83b3fccf5cdea5881570011d32d079c5679b14cc74' 
  AND token = 'Rm56i9Iqo56TQ/xbOzHNkAXJ4GpuvcztUFUaLcn0ChU=' 
  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"
    }
  }
}