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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0330a22e2f0fc400c914c55a3711561f7eab3b21c032d9529502b72955785ec6' 
  AND token = '/KXORmOcVRbvB52WoJ1QCfdSPk2mEaXu9BzJc+Ar5Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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